Samuel Burgos is 8 years old. One day he brought a toy gun to school in his backpack. That got him expelled from his Miami school for two years. Toy guns violate his school district’s zero-tolerance policy for weapons.

The district offered to place Sam in a correctional school; his parents opted to home-school him instead. His father told the local NBC affiliate, “I can’t sit here and allow them to send my kid to a school where students have committed actual crimes,” Burgos said. “He hasn’t committed a crime.”

Sam misses his friends. And he may have to repeat the second grade. All because common sense has gone missing from Broward County’s schools. That’s what makes the school board’s response especially galling:

The school board says it’s common sense to know that this kind of item can’t be allowed on school campus and that responsibility also falls on parents to know what their children have in their backpacks.

The Burgos family has suffered enough. Toy guns are not weapons. They are toys. The school board should exercise a bit of common sense and reinstate Sam immediately.

You must also write ‘‘REPLICA EXPLOSIVE’’ on the package “using at least 20 point type or letters at least 1⁄4-inch high.”

Unlike most Regulations of the Day, this makes some sense. Many a post office has shut down because of false bomb scares. An uncle sending his nephew a birthday present could theoretically grind a major city’s mail service to a halt.

That isn’t the uncle’s fault; it’s the hyper-sensitive post-9/11 security mindset’s fault. Sadly, that mindset won’t be going away any time soon. This rule will hopefully prevent some false positives . Labeling the package lets postal workers know that they need not freak out. The Registered Mail requirement allows postal workers to verify that the grenades are, indeed, harmless.

Of course, the new rule treats the symptom, not the disease. It should hopefully reduce the amount of unnecessary bomb scares. But the real problem is the ingrained human habit of over-reacting to terrorism.

Terrorist attacks are extraordinarily rare, and need to be treated that way. Until common sense awakens from its post-9/11 slumber, this regulation may actually do some good.